Backend and Mobile App Developer to build Android and iOs Application and interface our Hardware (Uber Like App)

we are a small taxi company with about 50+ vehicles (in the same class) we want to build our own app to manage the taxis and for our clients to use there is already some tracking hardware installed in the Taxis that give us gps information and connects using gprs. (more details to the selected candidate) any freelancer Teams that have done similar projects will be strongly considered thanks